product certainly functional and elegant, but for 2 days! .... after 3 days the outline takes a nasty dirty color, probably due the poor quality of plastic "soft". the valve is about to follow the same path, particularly at the joint of the opening. can be would I take the gray, it would have been less messy! I took this model because it is one of the only ones able to allow charging valve closed, but I regret my purchase, it is not worth the price it is sold, it must cost less than a euro to manufacturing. ..